Electric hoist.



No. 793,626. PATENTED JUNE'27, 1905. P. J. DARLINGTON. ELECTRIC HOIST.

APPLIdATION FILED JAN. 28, 1904.

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PATENTED JUNE 27, 1905.

P. J. DARLINGTON.

ELECTRIC HOIST.

APPLIOATIOH FILED um. 28, 1904,

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PATENTED JUNE 27, 1905.

P. J. DARLINGTON. ELECTRIC HOIST.

APPLICATION FILED JAN. 28, 1904. 7

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DI J ID WITNESSES:

UNITED STATES Patented June 27, 1905.

PATENT CEEICE.

PHILIP J. DARLINGTCN, OF GLENRIDGE, NEW JERSEY, ASSIGNOR, BY

MESNE ASSIGNMENTS, TO SPRAGUE ELECTRIC COMPANY, A COR- ELECTRSIC HOIST.

SPECIFICATION forming part of Letters Patent No. 793,626, dated June 27,1905.

Application filed January 28, 1904. Serial No. 190,948.

To a whom it may concern:

Be it known that I, PHILIP J. DARLINGTON, a citizen of the UnitedStates, residing at Glenridge, county of Essex, State of New Jersey,have invented certain new and useful Improvements in Electric Hoists, ofwhich the following is a specification.

Myinvention relates to electrically-operated hoists, and has particularreference to means for cutting out the hoisting-motor to preventoverwinding of thehoisting-ropes,and thereby an injury to the apparatusor workman, which might otherwise result through a failure of theoperator to stop the motor at the right time.

Although the invention is capable of use in connection with any hoistingapparatus in which the winding-drum is drivenby an electric motor, Ihave chosen in the present case to illustrate it applied to afoundry-hoist of the type disclosed in Patent N 0.732619, granted to meJune 30, 1903.

The objects and nature of my invention will be best understood uponreference to the following detailed description taken in connection withthe accompanying drawings, and the various combinations and features ofthe invention will be specifically pointed out in the appended claims.

In said drawings, Figure 1 is an elevation of a portion of a hoistconstructed in accordance with my invention. Fig. 2 is an end view ofthe same, illustrating particularly the location of the winding-drums.Fig. 3 is a diagram of the controller and motor connections. Fig. 4 is aview illustrating the controller and its operating parts, with thecontroller casing and the operating-wheel shown in section. Fig. 5 is anend view of the controller, showing the operating-wheel and connectingparts .in the position corresponding to the hoisting position of thecontroller; and Fig. 6 is a view similar to Fig. 5, illustrating theparts in a position corresponding to the OE position of the controllerand also showing the bralie applied.

Throughout the several views like characters refer to like parts.

The hoisting-motor, which is of the series type, is located in a casing1 and through the agency of suitable gearing located in the gearcase 2drives the winding-drums 3 to wind up the hoisting-rope 4, and therebyraise the pulley-block 5, which is provided with a suitable sheave 6,with which the rope 4 engages. The motor is adapted to be rotated ineither direction to raise or lower the load on the pulley-block 5through the agency of a controlling-switch or controller located in thecasing 7 and provided with an operating member or wheel 8, which may beactuated through a suitable hand-rope 9 to move the controller into itsvarious operative positions. The controller comprises a rotatablecontactcarrying member 10, mounted on a shaft 11 and provided withsegments 12 12 12 12 and 13 13 13 13, adapted to cooperate withcorresponding fingers 14., 14, 1a, 1a, and 14 to produce the necessarymotor connections. When the controller is moved to hoisting position,the contact-fingers 14 14 14E 14 are brought into contact with thecorrespondingsegments 12, 12, 12, and 12 and acireuit is completedthrough the motor-armature 15 and the field-coil 16 in series. On theother hand, when it is desired to lower the load the contact-fingers 14,1 1", 14, and 14: are brought into contact with the correspondingsegments 13, 13 13, and 13 and the direction of current-flow in thearmature 15 is reversed. If the controller is moved in this directionfar enough to bring the linger 14 into engagement with the segment 13.the motor-armature is shunted by the resistance R. The controller isalso provided with a blow-out coil B, located on the shaft 11 of thecontroller and adapted to create a magnetic field sufiicient to blow outarcs formed between the contact-fingers and segments of the controller.

The outer end of the controller-shaft 11 is provided with a cam 17,which is arranged to spread apart the brake-arms 18 and 19 whenever theeontroller is in hoisting or lowering position and to permit the spring20 to draw said arms together whenever the controller is in offposition. The arms 18 and 19 are provided with suitable brake-shoes 2122, which engage a disk 23 on the outer end of the shaft of thehoisting-motor.

The construction thus far described is substantially the same as that inthe patent previously referred to, and therefore need not be describedin greater detail in the present application.

In order to cut out the hoisting-motor at the right time to prevent anyinjury by overwinding of the hoisting-rope 4, the controller is returnedto off position. This is accomplished by rotatably mounting theoperatii'ig member 8 on the controller-sl'laft 1.1, providing means forlocking said member and shaft together, so that the controller may beoper ated in response to the movements of the hand-rope 9, and providingother means actuated directly by the pulley-block 5 for tripping thelocking means, so as to free the shaft 10 and allow the controller toreturn to off position under the action of a suitable spring 2 T. Thisreturn-spring is coiled about the shaft 11 and terminates in radialportions which bear on the opposite sides of a fixed lug 25, located onthe end of the controllereasing, and a cooperating lug 28, located on atriangular latch member 27, keyed to the shaft 11. From the normalposition of the parts illustrated in Fig. 6 and COI'IOSPOI'Kllllg to theoff position of the controller the latch member 27 may be moved eitherto the right or to the left to connect the motor for hoisting orlowering.

The locking mechanism for connecting the OPOIELiJlHg-WllGOl 8 and therotatable member 10 of the controller comprises a spring-pressed latch28, pivoted to the member 27 and adapted to cooperate with theprojection 29 on said member to engage a lug 30 on wheel 8 to lock saidwheel and latch member in the manner illustrated in Fig. 5. When solocked, the controller may be moved to any of its operative positions bysimply turning the wheel 8. The location of the parts of the lockingmechanism with reference to the operative position ofthe controller issuch that when the controller is moved to hoisting position, which isthe position illustrated in Fig. 4, a projecting pin 31 on the latch 28will lie in the path of movement of the head 2J2 of a small lever 33,pivoted to the lower edge of the controller-casing. This lever isconnected at its lower end by a link 34 to a bell-crank lever 35,pivoted to aconvenient point on the hoist and having one arm extendinginto the path of movement of the pulleyblock 5. These levers, whichconstitute the trippii'ig mechanism for the latch 28, are normally heldin the position illustrated in Fig. 1 by the spring 36. In operationwhenever the operator leaves the controller in hoisting position asullicient time for the pulley-block to reach the lever 35 said lever ismoved against the tension of its spring 36 and the head 32 of the lever33 is thrust upward, whereupon the latch 28 is moved out of engagementwith the lug 30 on the operating-wheel 8 and through the action of thespring 2 T the controller is returned to off position and the brake issimultaneously applied, as illustrated in Fig. 6. After the latch 28 hasbeen once tripped the controller can be operated only by moving theoperating-wheel 8 to the position in which the latch 28 will engage thelug 30 and the operating-wheel and latch member 24. be again firmlylocked.

Although not essential to the OPOIEtlOH of the controller, I employ aspiral spring 37, located between the wheel 8 and the member 27 andhaving its opposite ends engaging said wheel and member and acting tomove one relative to the other. For certain positions of the controllerthis spring assists the spring 24 in producing a quick initial movementof the controller and at all times prevents the wheel 8 from sticking tothe shaft 11, as might readily occur if the lubrication were poor.

From the above disclosure it will be apparent that many alterations andmodifications may be made in the specific construction shown withoutdeparting from the spirit and scope of my invention, and I therefore donot wish to be limited to the specilic construction shown, but aim tocover by the terms of the appended claims all such alterations andmodifications.

i/Vhat I claim as new, and desire to secure by Letters Patent of theUnited States, is

1. The combination with a wiiuling-drum and a pulley-block to beoperated thereby, of an electric motor for operating said drum, anelectric circuit including said motor, a controlling-switch in saidcircuit, an operating member, means for locking said member to themovable contact-carrying member of said switch, means for returning saidcontact-carrying member to its off position when said members areunlocked, and means controlled by said pulley-block for unlocking saidmembersand allowing said switch to return to oil position.

2. The combination with an electric motor, of a controlling-switch incircuit therewith, an operating member, means for locking said operating member to the movable contact-carrying member of said switch,and means operated by said motor for unlocking said members.

3. The combination with an electric motor, of acontrolling-switch incircuit therewith, an operating member, means for locking said member tothe movable contact-carrying member of said switch, means :for returningsaid contact-carrying member to its off position when said members areunlocked, and means operated by said motor for unlocking said members.

t. The combination with an electric motor, of a controlling-switch incircuit therewith, a

movable operating member adapted to be locked to said switch to move itinto its closed position, means for returning said switch to openposition when said member is unlocked, and means operated by said motorfor unlocking said member.

5. The combination with an electric motor, of a controlling-switch incircuit therewith operable to connect the motor for rotation in eitherdirection, a movable member adapted to be locked to said switch to moveit into either of its operative positions, means for returning saidswitch to open position when said member is unlocked, and means operatedby said motor for unlocking said member.

6. The combination with the rotatable contact-carrying member of acontrolling-switch and a rope-wheel for operating said contactcarryingmember, of a latch member rigidly secured to said contact-carryingmember, a spring for normally holding said contact-carrying member inoff position, a lug on said and member to move said wheel and memberrelative to each other, a casing for said member, and a spring actingbetween said member and casing to move said member relative to saidcasing.

In witness whereof I have hereunto set my hand this 22d day of January,1904.

PHILIP J. DARLINGTON.

Witnesses:

PAUL MULLER, ROGER H. BUTTERWORTH.

